Vulnerability DatabaseCVE-2026-6346
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CVE-2026-6346
Published:May 18, 2026
Updated:September 25, 2026
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to sanitize sensitive configuration fields before including them in support packet generation, which allows a Mattermost System Admin or any party with access to a support packet to obtain sensitive credentials in plaintext via downloading a support packet from the System Console.. Mattermost Advisory ID: MMSA-2026-00607
Affected Packages
https://github.com/mattermost/mattermost.git (GITHUB):
Affected version(s) >=v10.11.0 <v10.11.14
Fix Suggestion:
Update to version v10.11.14
https://github.com/mattermost/mattermost.git (GITHUB):
Affected version(s) >=v11.5.0 <v11.5.2
Fix Suggestion:
Update to version v11.5.2
https://github.com/mattermost/mattermost.git (GITHUB):
Affected version(s) >=v11.4.0 <v11.4.4
Fix Suggestion:
Update to version v11.4.4
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.5.0 <v11.5.2
Fix Suggestion:
Update to version v11.5.2
github.com/mattermost/mattermost/server/v8 (GO):
Affected version(s) >=v8.0.0-20230429093631-aac4f2337933 <v8.0.0-20260326202606-fac92f4a71f3
Fix Suggestion:
Update to version v8.0.0-20260326202606-fac92f4a71f3
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.4.0 <v11.4.4
Fix Suggestion:
Update to version v11.4.4
github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.11.0 <v10.11.14
Fix Suggestion:
Update to version v10.11.14
Related Resources (6)
https://github.com/mattermost/mattermost/commit/fac92f4a71f356009e27983a980f729f599e8ba5
https://github.com/mattermost/mattermost
https://github.com/advisories/GHSA-9p64-jpc7-m2rp
https://mattermost.com/security-updates
https://nvd.nist.gov/vuln/detail/CVE-2026-6346
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6346.json
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CVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Exposure of Sensitive Information to an Unauthorized Actor
CWE-200
EPSS
Base Score:
0.41